Effect of taxes and subsidies on price

Taxes and subsidies change the price of goods and, as a result, the quantity consumed. There is a difference between an ad valorem tax and a specific tax or subsidy in the way it is applied to the price of the good. In the end, levying a tax moves the market to a new equilibrium where the price of a good paid by buyers increases and the proportion of the price received by sellers decreases.

The incidence of a tax does not depend on whether the buyers or sellers are taxed since taxes levied on sellers are likely to be met by raising the price charged to buyers. Most of the burden of a tax falls on the less elastic side of the market because of a lower ability to respond to the tax by changing the quantity sold or bought.

Introduction of a subsidy, on the other hand, may either lowers the price of production which encourages firms to produce more, or lowers the price paid by buyers, encouraging higher sales volume. Such a policy is beneficial both to sellers and buyers.

Specific tax impact

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The effect of a specific tax levied on sellers can be divided into three steps.

First, the demand for a good is the same for a given price level so the demand curve does not change. On the other hand, the tax makes the good in fact more expensive to produce for the seller. This means that the business is less profitable for a given price level and the supply curve shifts upwards.

Second, the higher cost of producing the good reduces the quantity supplied at any given price. The upward shifted supply curve is parallel to the original supply curve because no matter the quantity supplied, the seller's expenses on the production are the same. Therefore, the distance between the original and the new shifted supply curve is equal to the amount of tax imposed. Whatever the price of the good, the net price for which the sellers are selling is effectively the gross price less the amount of the tax. This makes the sellers supply the amount of the good as if the price were lower by the amount of the tax. In order for them to supply a given quantity of the good, the market price needs to be higher by the amount of tax to preserve net income from sales.

Last, after the shift of the supply curve is taken into account, the difference between the initial and after-tax equilibrium can be observed. The growth of market price is determined by the price elasticities of demand and supply. In the case of demand being more elastic than supply, the incidence of the tax falls more heavily on sellers and the consumers feel a smaller growth of price and vice versa. In both cases, the consumers pay more for the good and while the sellers initially receive more money, after the tax is accounted for, they are left with less money than if there were no tax imposed.

The tax raises the price which the customers pay for the good (unless the absorb the whole tax cost) and lowers the price the producers are effectively selling the good for unless they pass on the whole tax cost. The difference between the two prices remains the same no matter who bears most of the burden of the tax.

Example

The original equilibrium price is $3.00 and the equilibrium quantity is 100. The government then levies a tax of $0.50 on the sellers. This leads to a new supply curve which is shifted upward by $0.50 compared to the original supply curve. The new equilibrium price will sit between $3.00 and $3.50 and the equilibrium quantity will decrease. If we say that the consumers pay $3.30 and the new equilibrium quantity is 80, then the producers keep $2.80 and the total tax revenue equals $0.50 x 80 = $40.00. The burden of the tax paid by buyers is $0.30 x 80 = $2.40 and the burden paid by sellers equals $0.20 x 80 = $1.60.

Ad valorem tax impact

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Effect of elasticity

Depending on the price elasticities of demand and supply, who bears more of the tax or who receives more of the subsidy may differ. Where the supply curve is less elastic than the demand curve, producers bear more of the tax and receive more of the subsidy than consumers as the difference between the price producers receive and the initial market price is greater than the difference borne by consumers. Where the demand curve is more inelastic than the supply curve, the consumers bear more of the tax and receive more of the subsidy as the difference between the price consumers pay and the initial market price is greater than the difference borne by producers.

For instance, scientific evidence confirms that tobacco taxation result in lower tobacco consumption. Most studies indicate an elasticity of 0.4 to 0.5. That is to say, a 10 % price increase reduces cigarette consumption by 4 % to 5 %.

An illustration

The effect of this type of tax can be illustrated on a standard supply and demand diagram. Without a tax, the equilibrium price will be at Pe and the equilibrium quantity will be at Qe.

After a tax is imposed, the price consumers pay will shift to Pc and the price producers receive will shift to Pp. The consumers' price will be equal to the producers' price plus the cost of the tax. Since consumers will buy less at the higher consumer price (Pc) and producers will sell less at a lower producer price (Pp), the quantity sold will fall from Qe to Qt.

center|Diagram illustrating taxes effect